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CVE

CVE-2026-56278

Flowise - Session Hijacking via Weak Default Express Session Secret
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CVE

CVE-2026-56278

Flowise - Session Hijacking via Weak Default Express Session Secret

Flowise before 3.1.0 (affected versions 3.0.13 and earlier) uses a weak hardcoded default secret ('flowise') for the express-session middleware when the EXPRESSSESSIONSECRET environment variable is not set (packages/server/src/enterprise/middleware/passport/index.ts). Because this default secret is publicly visible in the source code, an attacker can forge valid signed session cookies to impersonate any user and bypass authentication.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56278.json, https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwh, https://nvd.nist.gov/vuln/detail/CVE-2026-56278, https://www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-express-session-secret

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00367%
EPSS Percentile
0.30043%
Introduced Version
0
Fix Available
378d3ec3bd2d4157d6aa694bbc5ffa50c4159b97

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