CVE-2021-3298: Collabtive 3.1 allows XSS when an authenticated user enters an XSS payload into the address section of the pro

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MEDIUM 5.4DOWNGRADE

CVE-2021-3298 is a medium-severity flaw (CVSS 5.4) affecting collabtive. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Collabtive 3.1 allows XSS when an authenticated user enters an XSS payload into the address section of the profile edit page, aka the manageuser.php?action=edit address1 parameter.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-01-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: o-dyn

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

Am I affected?

Timeline

2021-01-29 06:15 UTCPublished CVE record published
2026-06-17 04:04 UTCUpdated Record last modified

o-dyn collabtive DOWNGRADE

Affected: 3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.1 (Debian / Ubuntu)

apt-cache madison collabtive sudo apt install collabtive=<VERSION_BEFORE_3.1> sudo apt-mark hold collabtive

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

dnf --showduplicates list collabtive sudo dnf downgrade collabtive-<VERSION_BEFORE_3.1> sudo dnf versionlock add collabtive

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.

Exploit-DB: Collabtive 3.1 - 'address' Persistent 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-2021-3298?

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

Is CVE-2021-3298 being exploited?

CVE-2021-3298 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-2021-3298 affect?

CVE-2021-3298 affects collabtive. Severity is medium (CVSS 5.4). Collabtive 3.1 allows XSS when an authenticated user enters an XSS payload into the address section of the profile edit page, aka the manageuser.php?action=edit address1 parameter.

How urgent is CVE-2021-3298?

Priority 44/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-13655 MEDIUM 6.1 DOWNGRADE An issue was discovered in Collabtive 3.0 and later
CVE-2019-8935 MEDIUM 5.4 DOWNGRADE Collabtive 3.1 allows XSS via the manageuser.php?action=profile id parameter.
CVE-2015-0258 HIGH 8.8 UPGRADE MITIGATE Multiple incomplete blacklist vulnerabilities in the avatar upload functionality in manageuser.php in Collabti
CVE-2014-3247 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in Collabtive 1.2 allows remote authenticated users to inject arbitra
CVE-2014-3246 MEDIUM 6.5 DOWNGRADE SQL injection vulnerability in Collabtive 1.2 allows remote authenticated users to execute arbitrary SQL comma

References

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