CVE-2026-116372
MISP mispguard: Feed responses with 2xx status codes other than 200 bypass filtering rules
02 Description
MISP mispguard: Feed responses with 2xx status codes other than 200 bypass filtering rules
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.36% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 29.8% of scored records. A rank, not a probability.
- NVD base score
- 7.7 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- 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
- 2026-10-26 08:36Z3 DAYS AGO
- Last updated
- 2026-10-26 08:36Z3 DAYS AGO
- Reserved
- 2026-10-26
- Assigning CNA
- CIRCL
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.7)
- CNA CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N
- Weaknesses
- CWE-20Improper Input ValidationClass
- Data version
- 5.2
- Document digest
- bce96b6c2fd82aa2091b8b743183ebfa73b3695ecc7f8b43826ae39a7a1bc311
05 Affected products
06 References
- github.comSecurity patchhttps://github.com/MISP/misp-guard/commit/b5f606a4e57a49cc4dbf9b3ef0c6ddd19f866735
07 Remediation
The fix adds an explicit check in process_feed_response that rejects any HTTP response with a status code in the 201-299 range (i.e., successful responses other than 200) by returning a 403 Forbidden response. This ensures that only responses with exactly status code 200 are subject to the normal filtering pipeline, and all other 2xx responses are blocked before they can reach the MISP instance, closing the bypass vector.