CVE-2009-4924
Cross-site Scripting in python-cjson
CVE-2009-4924 is a medium vulnerability (CVSS 4.3) in Dan Pascu Python-cjson, published July 2, 2010. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.35%, the 71st percentile. Fixed in python-cjson 1.1.0.
Dan Pascu python-cjson 1.0.5 does not properly handle a ['/'] argument to cjson.encode, which makes it easier for remote attackers to conduct certain cross-site scripting (XSS) attacks involving Firefox and the end tag of a SCRIPT element.
Exploit likelihood
What each source reports
NVD Score used
Dan Pascu python-cjson 1.0.5 does not properly handle a ['/'] argument to cjson.encode, which makes it easier for remote attackers to conduct certain cross-site scripting (XSS) attacks involving Firefox and the end tag of a SCRIPT element.
- Record
CVE-2009-4924- CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
Dan Pascu python-cjson 1.0.5 does not properly handle a ['/'] argument to cjson.encode, which makes it easier for remote attackers to conduct certain cross-site scripting (XSS) attacks involving Firefox and the end tag of a SCRIPT element.
- Record
CVE-2009-4924- Updated
- 2026-11-02
EUVDEUVD-2010-0028 No score
Dan Pascu python-cjson 1.0.5 does not properly handle a ['/'] argument to cjson.encode, which makes it easier for remote attackers to conduct certain cross-site scripting (XSS) attacks involving Firefox and the end tag of a SCRIPT element.
- Record
EUVD-2010-0028- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-95jp-77w6-qj52
Cross-site Scripting in python-cjson
Python-cjson 1.0.5 does not properly handle a ['/'] argument to cjson.encode, which makes it easier for remote attackers to conduct certain cross-site scripting (XSS) attacks involving Firefox and the end tag of a SCRIPT element.
- Record
GHSA-95jp-77w6-qj52- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVGHSA-95jp-77w6-qj52
Cross-site Scripting in python-cjson
Python-cjson 1.0.5 does not properly handle a ['/'] argument to cjson.encode, which makes it easier for remote attackers to conduct certain cross-site scripting (XSS) attacks involving Firefox and the end tag of a SCRIPT element.
- Record
GHSA-95jp-77w6-qj52- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVPYSEC-2010-26 No score
Dan Pascu python-cjson 1.0.5 does not properly handle a ['/'] argument to cjson.encode, which makes it easier for remote attackers to conduct certain cross-site scripting (XSS) attacks involving Firefox and the end tag of a SCRIPT element.
- Record
PYSEC-2010-26- Updated
- 2026-11-02
OSVUBUNTU-CVE-2009-4924 No score
Dan Pascu python-cjson 1.0.5 does not properly handle a ['/'] argument to cjson.encode, which makes it easier for remote attackers to conduct certain cross-site scripting (XSS) attacks involving Firefox and the end tag of a SCRIPT element.
- Record
UBUNTU-CVE-2009-4924- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
python-cjsonPyPI |
before 1.1.0 | 1.1.0 |
python-cjsonPyPI |
before 1.1.0, plus listed versions 1.0.01.0.11.0.21.0.31.0.41.0.5 |
1.1.0 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | affected | |
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |
References
pypi.python.org/pypi/python-cjson
t3.dotgnu.info/blog/insecurity/quotes-dont-help.html
nvd.nist.gov/vuln/detail/CVE-2009-4924
github.com/pypa/advisory-db/tree/main/vulns/python-cjson/PYSEC-2010-26.yaml
ubuntu.com/security/CVE-2009-4924
cve.org/CVERecord?id=CVE-2009-4924