CVE-2023-51535 | WordPress Spam protection, AntiSpam, FireWall by CleanTalk Plugin <= 6.20 is vulnerable to Cross Site Request Forgery (CSRF)

Cross-Site Request Forgery (CSRF) vulnerability in СleanTalk - Anti-Spam Protection Spam protection, Anti-Spam, FireWall by CleanTalk.This issue affects Spam protection, Anti-Spam, FireWall by CleanTalk: from n/a through 6.20.

Published: 2024-01-05 Last update: 2026-04-28 Assigner: [email protected] Source: [email protected]

Conclusion & alert: CVE-2023-51535 is rated Low Risk (23.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.08%). Mandatory action: 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-2023-51535

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 2025-03-30 0.68% 0.08% -0.60%
2 2025-03-29 0.06% 0.68% +0.62%
3 2024-01-10 0.06%

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-51535

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:N/UI:R/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:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
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]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H 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:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
2.8 5.9 [email protected]

Weakness enumeration for CVE-2023-51535

GitHub Security Advisory for CVE-2023-51535

GHSA-mf62-7364-m8fq · Severity: medium — Cross-Site Request Forgery (CSRF) vulnerability in ?leanTalk - Anti-Spam Protection Spam...

Affected software / configurations for CVE-2023-51535

Vendor Product Version Raw CPE
cleantalk spam_protection\,_antispam\,_firewall <= 6.20 cpe:2.3:a:cleantalk:spam_protection\,_antispam\,_firewall:*:*:*:*:*:wordpress:*:*

References for CVE-2023-51535

cvelogic Threat Intelligence