TI-2026-79489 Aliases CVE-2026-115507 GHSA-j37p-9r5c-rjgj

HTML injection in Vikunja notification email header

MEDIUM 56CWE-79Published 2026-10-22 · Updated 2026-11-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

Vikunja from 2.2.0 before 2.7.1 contains an HTML injection flaw in the notification email header, where display names and task and project titles are inserted into email anchors without escaping (CWE-79). An authenticated user with low privileges can craft a title or display name that closes the anchor and injects phishing links into task comment and mention notification emails sent to project members. User interaction is required.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

Vikunja 2.2.0 before 2.7.1 contains an HTML injection vulnerability in CreateConversationalHeader in pkg/notifications/mail.go that interpolates display names and task and project titles raw into email anchors. Authenticated users can craft titles or display names that close the anchor and inject phishing links into task-comment and task-mention notification emails sent to project members.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00281 20th percentileScored 2026-11-07

Fix Fixed vikunja (go-vikunja): 2.7.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

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
go-vikunja	vikunja	2.2.0 to before 2.7.1	2.7.1	Patch available	CNA

vikunja Vendorgo-vikunja Affected 2.2.0 to before 2.7.1 Fixed in 2.7.1 Patch available CNA

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:vikunja:vikunja::::::::	—	—	go-vikunja

cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* Versions — — ·go-vikunja

Remediation

Upgrade go-vikunja vikunja to version 2.7.1 or later, which fixes the issue. The sources list no other fixed versions for vikunja.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Fix · CNA vikunja (go-vikunja) Fixed in 2.7.1

Timeline

2026-10-22 Threatist record created from CVE-2026-115507
2026-10-22 Alias added: GHSA-j37p-9r5c-rjgj
2026-11-04 CISA SSVC decision points changed
2026-11-04 Priority changed: LOW → MEDIUM

References

Patch 1

https://github.com/go-vikunja/vikunja/commit/18ff05932632c65dbc90a88118597989c6af4bf9

Advisory 1

GitHub Security Advisory (GHSA-rp33-8f2m-hm6j)

Other 3

TI-2026-40929 Authorization bypass in go-vikunja Vikunja CVSS 4.0CRITICAL 9.3
TI-2026-21967 Vijkunja has Weak Password Policy Combined with Persistent Sessions After Password Change CVSS 3.1CRITICAL 9.1
TI-2026-62115 Vikunja before 2.6.0 Privilege Escalation via Link Share Hash CVSS 4.0HIGH 8.7
TI-2026-62108 Vikunja before 2.6.0 Authentication Bypass via CalDAV BasicAuth CVSS 4.0HIGH 8.7
TI-2026-62107 Vikunja before 2.6.0 Authentication Bypass via Unthrottled API CVSS 4.0HIGH 8.7
TI-2026-26971 Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path CVSS 3.1CRITICAL 9.1

See all 66 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences