Submitty through 20.04.01 has an open redirect via authentication/login?old= during an invalid login attempt.

published 2020-05-16 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-5397

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.9%; EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits: 0; none known, plus a Nuclei check

Exploit prediction

2.93% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template Submitty <= 20.04.01 - Open Redirect nuclei detection template
github.com https://github.com/Submitty/Submitty/issues/5265 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	5.8	AV:N/AC:M/Au:N/C:P/I:P/A:N

Classification

Weakness

CWE-601 URL Redirection to Untrusted Site

References

github.com /Submitty/Submitty/issues/5265
exploit, issue-tracking, third-party-advisory

Sources

CVE List CVE-2020-13121
NVD CVE-2020-13121

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