Overhang Tutor Discloses Sensitive Information due to Improper Cache-Control

published 2025-11-26 11 mo ago modified 2026-11-04 4 d ago also GHSA-gq25-78jf-v78c , PYSEC-2025-219 , EUVD-2025-199747

cvss: 3.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits: 0; none known

An issue was discovered in Overhang.IO (tutor-open-edx) (overhangio/tutor) 20.0.2 allowing local unauthorized attackers to gain access to sensitive information due to the absence of proper cache-control HTTP headers and client-side session checks.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 11 mo ago (2025-11-28)

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CNA	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
OSV	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
GitHub	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	tutor	<=20.0.2	no fix listed

Classification

Weakness

CWE-524 Use of Cache Containing Sensitive Information
CWE-384 Session Fixation

References

github.com /overhangio/tutor
package, product
docs.tutor.edly.io
web, product
github.com /Rivek619/CVE-2025-65681
web, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2025-65681
advisory
github.com /pypa/advisory-database/tree/main/vulns/tutor/PYSEC-2025-219.yaml
web
github.com /advisories/GHSA-gq25-78jf-v78c
advisory

Sources

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.

Summary