CVE-2026-34587
high
CVSS v3
—
CVSS v4 NEW
—
VIR risk
8.0
Description
Kirby has Server-Side Template Injection (SSTI) via double template resolution in option rendering
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist | getkirby/cms | <4.9.0 | 4.9.0 |
| Packagist | getkirby/cms | >=5.0.0,<5.4.0 | 5.4.0 |
| COMPOSER | getkirby/cms | >= 5.0.0, < 5.4.0 | 5.4.0 |
| COMPOSER | getkirby/cms | < 4.9.0 | 4.9.0 |
References
- https://github.com/getkirby/kirby/security/advisories/GHSA-jcjw-58rv-c452
- https://nvd.nist.gov/vuln/detail/CVE-2026-34587
- https://github.com/getkirby/kirby
- https://github.com/getkirby/kirby/releases/tag/4.9.0
- https://github.com/getkirby/kirby/releases/tag/5.4.0
- https://github.com/advisories/GHSA-jcjw-58rv-c452
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.