Stored XSS via Pre-Login Notice Image Upload Serves Attacker HTML from Application Origin
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 2026.1
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
openEQUELLA, an open-source content management and learning platform, is affected by a flaw in its pre-login notice image upload feature. Attackers who hold a specific administrative permission, or who can use an account granted that permission such as a guest or everyone role, can upload HTML files that run malicious scripts in other users' browsers, potentially stealing sessions or performing actions on their behalf.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
In openEQUELLA before 2026.1, the pre-login notice image upload endpoint (PUT /api/preloginnotice/image/{name}) does not validate the type of uploaded files and serves them with a Content-Type derived from the supplied filename. A user holding the EDIT_SYSTEM_SETTINGS permission can upload an HTML file that is then served as text/html from the openEQUELLA origin, resulting in stored cross-site scripting. Unauthenticated exploitation is possible where EDIT_SYSTEM_SETTINGS has been granted to the guest user or everyone.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Apereo Foundation openEQUELLA
From 2019.1 · fixed in 2026.1