CVE-2026-9109 | GPTranslate <= 2.31 - Unauthenticated Stored Cross-Site Scripting via REST API Translation Storage

The GPTranslate – Multilingual AI Translation for WordPress: Automatically Translate Websites plugin for WordPress is vulnerable to Stored Cross-Site Scripting via REST API Translation Storage in all versions up to, and including, 2.31 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The deterministically derived API key (sha256 of the site URL) is printed in the HTML source of every page via the JavaScript variable gptApiKey, meaning any unauthenticated visitor can retrieve the key and submit malicious translation payloads to the /wp-json/gptranslate/v1/request endpoint without any additional precondition.

Published: 2026-06-13 Last update: 2026-06-15 Assigner: [email protected] Source: [email protected]

Conclusion & alert: CVE-2026-9109 is rated Low Risk (37.5/100): CVSS High severity, with low exploitation likelihood (EPSS 0.33%). 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-2026-9109

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 2026-06-15 0.16% 0.33% +0.17%
2 2026-06-13 0.16%

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-9109

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.2 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/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:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
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.
3.9 2.7 [email protected]

Weakness enumeration for CVE-2026-9109

GitHub Security Advisory for CVE-2026-9109

GHSA-j66v-hr5c-cjh2 · Severity: high — The GPTranslate – Multilingual AI Translation for WordPress: Automatically Translate Websites...

Affected software / configurations for CVE-2026-9109

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-9109

URL Tags
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.27.5/assets/js/admin.js#L1
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.27.5/gptranslate.php#L1134
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.27.5/gptranslate.php#L3578
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.27.5/gptranslate.php#L3654
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.31/assets/js/admin.js#L1
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.31/gptranslate.php#L1134
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.31/gptranslate.php#L3578
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.31/gptranslate.php#L3654
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.32/assets/js/admin.js#L1
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.32/gptranslate.php#L1104
https://plugins.trac.wordpress.org/browser/gptranslate/tags/2.32/gptranslate.php#L3574
https://www.wordfence.com/threat-intel/vulnerabilities/id/1c93b564-5428-4b0e-bbe8-f1e1e68940ac?source=cve
cvelogic Threat Intelligence