cve.bz

CVE-2026-123529

5.1 mediumEPSS 0.2%

Medium (5.1) in go-vikunja vikunja. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.

On this page
Vikunja before 2.7.1 contains a stored CSS injection vulnerability that allows authenticated users with project write access to inject arbitrary CSS via unsanitized table-cell data-background-color attributes. Attackers can store crafted task descriptions or comments to render full-viewport phishing overlays or force zero-click outbound background-image requests that deanonymize viewers.

Severity

CVSS 4.0

5.1 medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

4.6 medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
EPSS
0.2% estimated probability of exploitation activity in the next 30 days; 5th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
CWE
CWE-1021 Improper Restriction of Rendered UI Layers or Frames
OWASP Top 10
A06:2025 Insecure Design
Published
Modified
NVD analysis
Deferred: the NVD does not plan to analyze it
Record from
the NVD, synced

Ask an AI about this CVE

ChatGPTClaudeGoogle AI Mode

Show the promptExplain CVE-2026-123529 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-123529?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-123529?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-123529 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.

Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.

Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
go-vikunja vikunjabefore 2.7.1

Attack patterns (CAPEC)

  • CAPEC-103 Clickjacking Likelihood: Medium · Severity: High
  • CAPEC-181 Flash File Overlay Severity: Medium
  • CAPEC-222 iFrame Overlay Likelihood: Medium · Severity: High
  • CAPEC-504 Task Impersonation Likelihood: Medium · Severity: High
  • CAPEC-506 Tapjacking Likelihood: Low · Severity: Low
  • CAPEC-587 Cross Frame Scripting (XFS) Severity: High
  • CAPEC-654 Credential Prompt Impersonation Likelihood: Medium · Severity: High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

Check your stackJSON