CVE-2021-33031: In LabCup before <v2_next_18022, it is possible to use the save API to perform unauthorized actions for users

Q: How do I fix CVE-2021-33031?

labcup: upgrade to v2_next_18022. Exact commands for each OS are on this page.

Q: Is CVE-2021-33031 being exploited?

CVE-2021-33031 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-33031 affect?

CVE-2021-33031 affects labcup. Severity is low (CVSS 3.1). In LabCup before <v2_next_18022, it is possible to use the save API to perform unauthorized actions for users without access to user management in order to, after successful exploitation, gain access to a victim's account. A user without th

Q: How urgent is CVE-2021-33031?

Priority 24/100. No elevated risk signals yet.

Routine

LOW 3.1UPGRADE

CVE-2021-33031 is a low-severity flaw (CVSS 3.1) affecting labcup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In LabCup before <v2_next_18022, it is possible to use the save API to perform unauthorized actions for users without access to user management in order to, after successful exploitation, gain access to a victim's account. A user without the user-management privilege can change another user's email address if the attacker knows details of the victim such as the exact roles and group roles, ID, and remote authentication ID settings. These must be

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-862
Published	2021-06-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: labcup

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-06-10 16:15 UTCPublished CVE record published
2026-06-17 03:54 UTCUpdated Record last modified

labcup labcup UPGRADE

Affected: < v2_next_18022

Fixed in: v2_next_18022

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy labcup || rpm -q labcup || labcup --version

2. UPGRADE to v2_next_18022 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade labcup

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade labcup

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-33031?

labcup: upgrade to v2_next_18022. Exact commands for each OS are on this page.

Is CVE-2021-33031 being exploited?

CVE-2021-33031 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-33031 affect?

CVE-2021-33031 affects labcup. Severity is low (CVSS 3.1). In LabCup before <v2_next_18022, it is possible to use the save API to perform unauthorized actions for users without access to user management in order to, after successful exploitation, gain access to a victim's account. A user without th

How urgent is CVE-2021-33031?

Priority 24/100. No elevated risk signals yet.

References

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