CVE-2023-0958 | Inisev Plugins (Various Versions) - Missing Authorization on handle_installation function

Several plugins for WordPress by Inisev are vulnerable to unauthorized installation of plugins due to a missing capability check on the handle_installation function that is called via the inisev_installation AJAX aciton in various versions. This makes it possible for authenticated attackers with minimal permissions, such as subscribers, to install select plugins from Inisev on vulnerable sites. CVE-2023-38514 appears to be a duplicate of this vulnerability.

Published: 2023-07-28 Last update: 2026-04-08 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-0958 is rated Low Risk (35.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.28%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-0958

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-22 0.22% 0.28% +0.06%
2 2025-11-21 0.43% 0.22% -0.20%
3 2025-11-18 — 0.43% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-0958

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 1.4 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2023-0958

Affected software / configurations for CVE-2023-0958

Vendor Product Version Raw CPE
backupbliss backup_migration < 1.2.8 cpe:2.3:a:backupbliss:backup_migration:*:*:*:*:*:wordpress:*:*
backupbliss clone < 2.3.8 cpe:2.3:a:backupbliss:clone:*:*:*:*:*:wordpress:*:*
copy-delete-posts duplicate_post < 1.4.0 cpe:2.3:a:copy-delete-posts:duplicate_post:*:*:*:*:*:wordpress:*:*
inisev enhanced_text_widget < 1.5.8 cpe:2.3:a:inisev:enhanced_text_widget:*:*:*:*:*:wordpress:*:*
inisev redirection < 1.1.4 cpe:2.3:a:inisev:redirection:*:*:*:*:*:wordpress:*:*
inisev rss_redirect_\&_feedburner_alternative < 3.8 cpe:2.3:a:inisev:rss_redirect_\&_feedburner_alternative:*:*:*:*:*:wordpress:*:*
inisev ssl_mixed_content_fix < 3.2.4 cpe:2.3:a:inisev:ssl_mixed_content_fix:*:*:*:*:*:wordpress:*:*
inisev ultimate_posts_widget < 2.2.5 cpe:2.3:a:inisev:ultimate_posts_widget:*:*:*:*:*:wordpress:*:*
mypopups pop-up < 1.2.0 cpe:2.3:a:mypopups:pop-up:*:*:*:*:*:wordpress:*:*
socialshare social_share_icons_\&_social_share_buttons < 3.5.8 cpe:2.3:a:socialshare:social_share_icons_\&_social_share_buttons:*:*:*:*:*:wordpress:*:*
ultimatelysocial social_media_share_buttons_\&_social_sharing_icons < 2.8.2 cpe:2.3:a:ultimatelysocial:social_media_share_buttons_\&_social_sharing_icons:*:*:*:*:*:wordpress:*:*

References for CVE-2023-0958

URL Tags
https://plugins.trac.wordpress.org/browser/backup-backup/tags/1.2.7/includes/banner/misc.php#L427 Product
https://plugins.trac.wordpress.org/browser/backup-backup/tags/1.2.8/includes/banner/misc.php#L434 Product
https://plugins.trac.wordpress.org/browser/copy-delete-posts/tags/1.3.8/banner/misc.php#L426 Product
https://plugins.trac.wordpress.org/browser/copy-delete-posts/tags/1.4.0/banner/misc.php#L434 Product
https://plugins.trac.wordpress.org/browser/enhanced-text-widget/tags/1.5.6/banner/misc.php#L339 Product
https://plugins.trac.wordpress.org/browser/enhanced-text-widget/tags/1.5.7/banner/misc.php#L351 Product
https://plugins.trac.wordpress.org/browser/feedburner-alternative-and-rss-redirect/tags/3.7/modules/banner/misc.php#L427 Product
https://plugins.trac.wordpress.org/browser/http-https-remover/tags/3.2.3/banner/misc.php#L427 Product
https://plugins.trac.wordpress.org/browser/pop-up-pop-up/tags/1.1.9/modules/banner/misc.php#L427 Product
https://plugins.trac.wordpress.org/browser/pop-up-pop-up/tags/1.2.0/modules/banner/misc.php#L432 Product
https://plugins.trac.wordpress.org/browser/redirect-redirection/tags/1.1.3/includes/banner/misc.php#L427 Product
https://plugins.trac.wordpress.org/browser/ultimate-posts-widget/tags/2.2.4/banner/misc.php#L343 Product
https://plugins.trac.wordpress.org/browser/ultimate-posts-widget/tags/2.2.5/banner/misc.php#L351 Product
https://plugins.trac.wordpress.org/browser/ultimate-social-media-icons/tags/2.8.0/banner/misc.php#L424 Product
https://plugins.trac.wordpress.org/browser/ultimate-social-media-icons/tags/2.8.2/banner/misc.php#L434 Product
https://plugins.trac.wordpress.org/browser/ultimate-social-media-plus/tags/3.5.7/banner/misc.php#L424 Product
https://plugins.trac.wordpress.org/browser/wp-clone-by-wp-academy/tags/2.3.7/modules/banner/misc.php#L438 Product
https://plugins.trac.wordpress.org/browser/wp-clone-by-wp-academy/tags/2.3.8/modules/banner/misc.php#L432 Product
https://plugins.trac.wordpress.org/changeset/2944041/ultimate-social-media-plus/tags/3.5.8/banner/misc.php?old=2823720&old_path=ultimate-social-media-plus%2Ftags%2F3.5.7%2Fbanner%2Fmisc.php Patch
https://plugins.trac.wordpress.org/changeset?old_path=%2Fcopy-delete-posts%2Ftags%2F1.3.8&old=2923021&new_path=%2Fcopy-delete-posts%2Ftags%2F1.3.9&new=2923021&sfp_email=&sfph_mail= Patch
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2823769%40http-https-remover%2Ftags%2F3.2.3&new=2944114%40http-https-remover%2Ftags%2F3.2.4 Patch
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2823770%40feedburner-alternative-and-rss-redirect%2Ftags%2F3.7&new=2944116%40feedburner-alternative-and-rss-redirect%2Ftags%2F3.8#file115 Patch
https://www.wordfence.com/threat-intel/vulnerabilities/id/cf7bdd0e-f3b3-4be5-8a30-2c6d9cb783a3?source=cve Third Party Advisory
cvelogic Threat Intelligence