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CVE-2026-91108— Alt Text AI <= 1.10.41 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Post Content Modification via atai_enrich_post_content AJAX Action

Quick assessment

Affected
alttextai Alt Text AI – Automatically generate image alt text for SEO and accessibility
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件 “Alt Text AI – Automatically generate image alt text for SEO and accessibility” 在所有版本（包括 1.10.41 及以下版本）中存在授权绕过漏洞。该漏洞源于插件未正确验证用户是否有权执行某项操作。这使得具有订阅者（Subscriber）及以上权限的已认证攻击者，能够覆写网站上任意文章或页面的 post_content 字段——包括他们并不拥有的内容——并填入由攻击者控制的关键词所影响的、由大型语言模型（LLM）

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-91108

Vulnerability Information
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Vulnerability Title
Alt Text AI <= 1.10.41 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Post Content Modification via atai_enrich_post_content AJAX Action
Source: CVE Program / CVE List V5
Vulnerability Description
The Alt Text AI – Automatically generate image alt text for SEO and accessibility plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.10.41. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to overwrite the post_content of any post or page on the site — including content they do not own — with LLM-generated text influenced by attacker-controlled keywords, enabling black-hat SEO manipulation and unauthorized consumption of the site owner's paid AltText.ai API credits. The nonce required to invoke the action is emitted on every admin page including /wp-admin/profile.php, which is accessible to Subscribers, making the nonce trivially obtainable by any authenticated user.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
alttextai Alt Text AI – Automatically generate image alt text for SEO and accessibility 0 ~ 1.10.41 -

II. Public POCs for CVE-2026-91108

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III. Intelligence Information for CVE-2026-91108

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Other References for CVE-2026-91108 (5)

IV. Related Vulnerabilities

Same product: Alt Text AI – Automatically generate image alt text for SEO and accessibility
Same vendor: alttextai
Same weakness: CWE-862

V. Comments for CVE-2026-91108

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