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CVE

CVE-2026-27637

FreeScout's Predictable Authentication Token Enables Account Takeover
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CVE

CVE-2026-27637

FreeScout's Predictable Authentication Token Enables Account Takeover

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.206, FreeScout's TokenAuth middleware uses a predictable authentication token computed as MD5(userid + createdat + APP_KEY). This token is static (never expires/rotates), and if an attacker obtains the APP_KEY — a well-documented and common exposure vector in Laravel applications — they can compute a valid token for any user, including the administrator, achieving full account takeover without any password. This vulnerability can be exploited on its own or in combination with CVE-2026-27636. Version 1.8.206 fixes both vulnerabilities.

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
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27637.json, https://github.com/freescout-help-desk/freescout/commit/004a8231f6e413af1d4680930b0e2342fd4283f9, https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6gcm-v8xf-j9v9, https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-mw88-x7j3-74vc, https://nvd.nist.gov/vuln/detail/CVE-2026-27637

Severity

9.8

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
9.8
EPSS Probability
0.00159%
EPSS Percentile
0.36811%
Introduced Version
0
Fix Available
004a8231f6e413af1d4680930b0e2342fd4283f9

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