CVE-2026-115507: XSS (CVSS 3.5)

Description

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.

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CVSS v3.1 Score

3.5

LOW

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

EPSS — Exploit Prediction

0.0028

Probability of exploitation

0.21%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

References

Other References

https://github.com/go-vikunja/vikunja https://github.com/go-vikunja/vikunja/blob/v2.7.0/pkg/notifications/mail.go#L132-L148 https://github.com/go-vikunja/vikunja/commit/18ff05932632c65dbc90a88118597989c6af4bf9 https://github.com/go-vikunja/vikunja/releases/tag/v2.7.1 https://github.com/go-vikunja/vikunja/security/advisories/GHSA-rp33-8f2m-hm6j https://www.vulncheck.com/advisories/vikunja-2.2.0-before-2.7.1-html-injection-via-notification-email-header

Frequently Asked Questions

What is CVE-2026-115507? +

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. It has a CVSS v3.1 base score of 3.5 (LOW).

How severe is CVE-2026-115507? +

CVE-2026-115507 has a CVSS v3.1 score of 3.5 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0028, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-115507? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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