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01 Record

CVE-2026-41887

Flarum: Path traversal in LESS parser via theme color settings (incomplete fix for CVE-2023-27577)

MediumPUBLISHEDCNA: GitHub_M
CNA base score4.9 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
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02 Description

Flarum: Path traversal in LESS parser via theme color settings (incomplete fix for CVE-2023-27577)

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.47% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 40.6% of scored records. A rank, not a probability.
NVD base score
4.9 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
NVD analysis status
Deferred. NVD last modified this record on 2026-10-26.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-05-08 15:50Z5 MO AGO
Last updated
2026-05-08 19:26Z5 MO AGO
Reserved
2026-04-22
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Medium (CVSS 4.9)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Weaknesses
  • CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')Base
  • CWE-918Server-Side Request Forgery (SSRF)Base
Data version
5.2
Document digest
e5501ad0a0462a6b99af87a6cd3031b41e378a015a8a55816298c6a33b322873

05 Affected products

VendorProductVersionsPlatforms
flarumframework< 1.8.16, >= 2.0.0-beta.1, < 2.0.0-rc.1—

06 References