CVE-2026-123515

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.

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Severity
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Affected
Versions
Attack patterns (CAPEC)
References
Your exposure

Vikunja before 2.7.1 contains a client-side request forgery vulnerability that allows users with write access to make viewers' clients request loopback or LAN addresses by storing img elements in rich text. Attackers can plant images in tasks, comments, project descriptions, or imported Markdown to trigger blind GET requests against local services and track when viewers open content.

Severity

CVSS 4.0

5.1 medium

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

CVSS 3.1

4.1 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

EPSS: 0.2% estimated probability of exploitation activity in the next 30 days; 6th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
CWE: CWE-441 Unintended Proxy or Intermediary (Confused Deputy)
OWASP Top 10: A01:2025 Broken Access Control
Published: 2026-11-08 02:16 UTC
Modified: 2026-11-08 02:16 UTC
NVD analysis: Deferred: the NVD does not plan to analyze it
Record from: the NVD, synced 2026-11-08 02:40 UTC

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Explain CVE-2026-123515 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-123515?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-123515?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-2026-123515 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.

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Affected

go-vikunja:vikunja

Versions

From the CNA's record in the CVE List.

Product	Affected
go-vikunja vikunja	before 2.7.1

Attack patterns (CAPEC)

CAPEC-219 XML Routing Detour Attacks Likelihood: High · Severity: Medium
CAPEC-465 Transparent Proxy Abuse Severity: Medium

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

References

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