CVE-2021-40923: Cross-site scripting (XSS) vulnerability in install/index.php in bugs 1.8 and below version allows remote atta

Q: How do I fix CVE-2021-40923?

bugs: upgrade to newer than 1.8. Exact commands for each OS are on this page.

Q: Is CVE-2021-40923 being exploited?

CVE-2021-40923 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-2021-40923 affect?

CVE-2021-40923 affects bugs. Severity is medium (CVSS 6.1). Cross-site scripting (XSS) vulnerability in install/index.php in bugs 1.8 and below version allows remote attackers to inject arbitrary web script or HTML via the email parameter.

Q: How urgent is CVE-2021-40923?

Priority 41/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2021-40923 is a medium-severity flaw (CVSS 6.1) affecting bugs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in install/index.php in bugs 1.8 and below version allows remote attackers to inject arbitrary web script or HTML via the email parameter.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-10-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: pixeline

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

Am I affected?

Timeline

2021-10-01 16:15 UTCPublished CVE record published
2026-06-17 04:07 UTCUpdated Record last modified

pixeline bugs UPGRADE

Affected: <= 1.8

Fixed in: newer than 1.8

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bugs

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-2021-40923?

bugs: upgrade to newer than 1.8. Exact commands for each OS are on this page.

Is CVE-2021-40923 being exploited?

CVE-2021-40923 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-2021-40923 affect?

CVE-2021-40923 affects bugs. Severity is medium (CVSS 6.1). Cross-site scripting (XSS) vulnerability in install/index.php in bugs 1.8 and below version allows remote attackers to inject arbitrary web script or HTML via the email parameter.

How urgent is CVE-2021-40923?

Priority 41/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-40924 MEDIUM 6.1 UPGRADE Cross-site scripting (XSS) vulnerability in install/index.php in bugs 1.8 and below version allows remote atta
CVE-2021-40922 MEDIUM 6.1 UPGRADE Cross-site scripting (XSS) vulnerability in install/index.php in bugs 1.8 and below version allows remote atta

References

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