CVE-2021-41791: An issue was discovered in Hyland org.alfresco:share through 7.0.0.2 and org.alfresco:community-share through

Routine

MEDIUM 5.4UPGRADEUPGRADE

CVE-2021-41791 is a medium-severity flaw (CVSS 5.4) affecting community share, share. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Hyland org.alfresco:share through 7.0.0.2 and org.alfresco:community-share through 7.0. An evasion of the XSS filter for HTML input validation in the Alfresco Share User Interface leads to stored XSS that could be exploited by an attacker (given that he has privileges on the content collaboration features).

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-10-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: alfresco

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

Am I affected?

Timeline

2021-10-21 09:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

alfresco community share UPGRADE

Affected: <= 7.0

Fixed in: newer than 7.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy community-share || rpm -q community-share || community-share --version

2. UPGRADE to newer than 7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade community-share

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade community-share

Note

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

alfresco share UPGRADE

Affected: >= 5.0.0.0 and <= 5.2.7.11 · >= 6.0.1.0 and <= 6.0.1.2 · >= 6.0.2.0 and <= 6.2.2.4 · >= 6.1.1.0 and <= 6.1.1.2 · 7.0 · 7.0.0.1 · 7.0.0.2 · 7.0.1

Fixed in: newer than 6.2.2.4

Safe to downgrade to: a release before 5.0.0.0

1. Check installed version

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

2. UPGRADE to newer than 6.2.2.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade share

Note

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

3. If no update is available yet, DOWNGRADE to a release before 5.0.0.0 (Debian / Ubuntu)

apt-cache madison share sudo apt install share=<VERSION_BEFORE_5.0.0.0> sudo apt-mark hold share

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list share sudo dnf downgrade share-<VERSION_BEFORE_5.0.0.0> sudo dnf versionlock add share

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.

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-2021-41791?

community share: upgrade to newer than 7.0; share: upgrade to newer than 6.2.2.4. Exact commands for each OS are on this page.

Is CVE-2021-41791 being exploited?

CVE-2021-41791 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-2021-41791 affect?

CVE-2021-41791 affects community share, share. Severity is medium (CVSS 5.4). An issue was discovered in Hyland org.alfresco:share through 7.0.0.2 and org.alfresco:community-share through 7.0. An evasion of the XSS filter for HTML input validation in the Alfresco Share User Interface leads to stored XSS that could be

How urgent is CVE-2021-41791?

Priority 30/100. No elevated risk signals yet.

References

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