Sakai Conversations has a Stored XSS Issue
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
Sakai is a Collaboration and Learning Environment (CLE). From versions 23.0 to before 23.5, and versions 25.0 to before 25.3, the Sakai Conversations tool stores topic and post messages without HTML sanitization, and the frontend renders them using LitElement's unsafeHTML() directive, resulting in stored cross-site scripting (XSS). Any authenticated user with access to a site that has the Conversations tool enabled can inject arbitrary HTML and JavaScript that executes in the browsers of all other users who view that topic or post. This issue has been patched in versions 23.5, 25.3, and 26.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| sakaiproject | sakai | 23.0 to before 23.5; 25.0 to before 25.3 | 23.5, 25.3 | Patch available | CNA |
| — | org.sakaiproject.conversations:sakai-conversations-impl (Maven) | 23.0 – 23.3 | — | No fix listed | GHSA-w2x5-gv52-9ccv |
| — | org.sakaiproject.kernel:sakai-kernel-impl (Maven) | 23.0 – 23.3 | — | No fix listed | GHSA-w2x5-gv52-9ccv |
| — | org.sakaiproject.rubrics:rubrics-impl (Maven) | 23.0 – 23.3 | — | No fix listed | GHSA-w2x5-gv52-9ccv |
- sakai Vendorsakaiproject Affected 23.0 to before 23.5; 25.0 to before 25.3 Fixed in 23.5, 25.3 Patch available CNA
- org.sakaiproject.conversations:sakai-conversations-impl (Maven) Vendor— Affected 23.0 – 23.3 Fixed in — No fix listed GHSA-w2x5-gv52-9ccv
- org.sakaiproject.kernel:sakai-kernel-impl (Maven) Vendor— Affected 23.0 – 23.3 Fixed in — No fix listed GHSA-w2x5-gv52-9ccv
- org.sakaiproject.rubrics:rubrics-impl (Maven) Vendor— Affected 23.0 – 23.3 Fixed in — No fix listed GHSA-w2x5-gv52-9ccv
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:sakailms:sakai:*:*:*:*:*:*:*:* | — | — | sakaiproject |
- cpe:2.3:a:sakailms:sakai:*:*:*:*:*:*:*:* Versions — — ·sakaiproject
Remediation
- Fix · CNA sakai (sakaiproject) Fixed in 23.5, 25.3
Timeline
- 2026-10-02 Threatist record created from CVE-2026-54049
- 2026-10-03 Alias added: GHSA-w2x5-gv52-9ccv
- 2026-10-06 CISA SSVC decision points changed
- 2026-10-06 Priority changed: LOW → HIGH
References
More sakaiproject vulnerabilities
- TI-2026-38984 Sakai: IDOR in Profile Image Deletion Allows Any Authenticated User to Delete Any User's Profile Image CVSS 3.1MEDIUM 6.5
- TI-2024-32130 Sakai: Kernel users created with type roleview can login as a normal user CVSS 4.0HIGH 8.7
- TI-2019-12135 Sakai through 12.6 allows XSS via a chat user name. CVSS 3.1MEDIUM 6.1
- TI-2025-38900 Sakai kernel-impl: predictable PRNG used to generate server‑side encryption key in EncryptionUtilityServiceImpl CVSS 3.1MEDIUM 5.9
- TI-2026-25799 SAK-52311: Sakai site-manage group titles can contain XSS content CVSS 4.0LOW 1.3
Sources
- CVE-2026-54049 · CVE Program
- CVE-2026-54049 · NVD
- FIRST EPSS
- GHSA-w2x5-gv52-9ccv · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences