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01 Record

CVE-2026-86688

Session id is not renewed on authentication in ash_authentication, allowing session fixation

HighPUBLISHEDCNA: EEF
CNA base score7.4 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
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02 Description

Session id is not renewed on authentication in ash_authentication, allowing session fixation

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total 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
0.74% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 54.2% of scored records. A rank, not a probability.
NVD base score
7.4 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/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 2026-09-18.
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
2026-09-17 21:58Z1 MO AGO
Last updated
2026-09-18 14:31Z1 MO AGO
Reserved
2026-09-17
Assigning CNA
EEF
Record state
PUBLISHED
Severity
High (CVSS 7.4)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weaknesses
Data version
5.2
Document digest
6fcf4582a0c9a5fbc6407f4597af5998a35c7b4e5ce320b538dd8cafcd84d274

05 Affected products

VendorProductVersionsPlatforms
team-alembicash_authentication0.2.0 to < 4.15.0, 5.0.0-rc.0 to < 5.0.0-rc.14, a939dde9b917c072cdf10c4b0913a9886a4b0231 to < *—

06 References