CVE-2016-3954 json
web2py exposure of sensitive information
published 2018-02-06 8 y ago modified 2026-07-07 4 mo ago also GHSA-jr83-vr4j-mp6p , PYSEC-2026-1062 , EUVD-2022-4423
- cvss
- 5.5
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 72%
- public exploits
- 0
- none known
Summary
web2py before 2.14.2 allows remote attackers to obtain the session_cookie_key value via a direct request to examples/simple_examples/status. NOTE: this issue can be leveraged by remote attackers to execute arbitrary code using CVE-2016-3957.
Patch / fix
- pypi web2py 2.14.2
- web2py web2py 2.14.2
- web2py Ubuntu 16.04 LTS 2.12.3-1ubuntu0.1
ubuntu advisories UBUNTU-CVE-2016-3954
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Exploit prediction
1.40% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- devco.re https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 5.5 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 2.1 | AV:L/AC:L/Au:N/C:P/I:N/A:N |
| GitHub | 3.0 | 5.5 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.0 | 5.5 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | web2py | <2.14.2 |
2.14.2 |
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
github.com
/web2py/web2py/commit/0820926b500a321060ef6a76ce89fd35a252f8b0
web
-
devco.re
/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/
exploit, technical-description, third-party-advisory
-
usn.ubuntu.com
/4030-1/
vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2016-3954
advisory
-
devco.re
/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957
web
-
github.com
/web2py/web2py
package
-
usn.ubuntu.com
/4030-1
web
-
pypi.org
/project/web2py
package
-
github.com
/advisories/GHSA-jr83-vr4j-mp6p
advisory
Sources
- CVE List CVE-2016-3954
- GitHub Advisory GHSA-jr83-vr4j-mp6p
- NVD CVE-2016-3954
- OSV PYSEC-2026-1062
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.