CVE-2021-26702: EPrints 3.4.2 exposes a reflected XSS opportunity in the dataset parameter to the cgi/dataset_dictionary URI.

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MEDIUM 6.1DOWNGRADE

CVE-2021-26702 is a medium-severity flaw (CVSS 6.1) affecting eprints. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

EPrints 3.4.2 exposes a reflected XSS opportunity in the dataset parameter to the cgi/dataset_dictionary URI.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-03-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: eprints

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

Am I affected?

Timeline

2021-03-01 22:15 UTCPublished CVE record published
2026-06-17 03:43 UTCUpdated Record last modified

eprints eprints DOWNGRADE

Affected: 3.4.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.4.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.4.2 (Debian / Ubuntu)

apt-cache madison eprints sudo apt install eprints=<VERSION_BEFORE_3.4.2> sudo apt-mark hold eprints

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list eprints sudo dnf downgrade eprints-<VERSION_BEFORE_3.4.2> sudo dnf versionlock add eprints

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: EPrints 3.4.2 - Cross-Site Scripting

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-2021-26702?

eprints: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-26702 being exploited?

CVE-2021-26702 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-2021-26702 affect?

CVE-2021-26702 affects eprints. Severity is medium (CVSS 6.1). EPrints 3.4.2 exposes a reflected XSS opportunity in the dataset parameter to the cgi/dataset_dictionary URI.

How urgent is CVE-2021-26702?

Priority 48/100. Public exploit reference

Related CVEs

CVE-2021-3342 CRITICAL 9.8 DOWNGRADE EPrints 3.4.2 allows remote attackers to read arbitrary files and possibly execute commands via crafted LaTeX
CVE-2021-26704 HIGH 8.8 DOWNGRADE EPrints 3.4.2 allows remote attackers to execute arbitrary commands via crafted input to the verb parameter in
CVE-2021-26703 CRITICAL 9.8 DOWNGRADE EPrints 3.4.2 allows remote attackers to read arbitrary files and possibly execute commands via crafted JSON/X
CVE-2021-26476 CRITICAL 9.8 DOWNGRADE EPrints 3.4.2 allows remote attackers to execute OS commands via crafted LaTeX input to a cgi/cal?year= URI.
CVE-2021-26475 MEDIUM 6.1 DOWNGRADE EPrints 3.4.2 exposes a reflected XSS opportunity in the via a cgi/cal URI.

References

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