CVE-2017-0897
ExpressionEngine version 2.x < 2.11.8 and version 3.x < 3.5.5 create an object signing token with weak entropy.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.04%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
ExpressionEngine version 2.x < 2.11.8 and version 3.x < 3.5.5 create an object signing token with weak entropy. Successfully guessing the token can lead to remote code execution.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 4.04% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-330, CWE-331
- Affected
- expressionengine/expressionengine
- Source
- support@hackerone.com
EPSS 4.0% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/99242Third Party Advisory, VDB Entry
- https://docs.expressionengine.com/latest/about/changelog.html#version-3-5-5Vendor Advisory
- https://docs.expressionengine.com/v2/about/changelog.html#version-2-11-8Vendor Advisory
- https://expressionengine.com/blog/expressionengine-3.5.5-and-2.11.8-releasedVendor Advisory
- https://hackerone.com/reports/215890Permissions Required
- http://www.securityfocus.com/bid/99242Third Party Advisory, VDB Entry
- https://docs.expressionengine.com/latest/about/changelog.html#version-3-5-5Vendor Advisory
- https://docs.expressionengine.com/v2/about/changelog.html#version-2-11-8Vendor Advisory
- https://expressionengine.com/blog/expressionengine-3.5.5-and-2.11.8-releasedVendor Advisory
- https://hackerone.com/reports/215890Permissions Required
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.