CVE-2020-8226: A vulnerability exists in phpBB <v3.2.10 and <v3.3.1 which allowed remote image dimensions check to be used to

Q: How urgent is CVE-2020-8226?

Priority 41/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.8REMOTEUPGRADE

CVE-2020-8226 is a medium-severity flaw (CVSS 5.8) affecting phpbb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability exists in phpBB <v3.2.10 and <v3.3.1 which allowed remote image dimensions check to be used to SSRF.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-610, CWE-918
Published	2020-08-17
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: phpbb

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

Am I affected?

Timeline

2020-08-17 16:15 UTCPublished CVE record published
2026-06-17 03:26 UTCUpdated Record last modified

phpbb phpbb UPGRADE

Affected: < 3.2.10 · >= 3.3.0 and < 3.3.1

Fixed in: 3.2.10, 3.3.1

Safe to downgrade to: a release before 3.3.0

1. Check installed version

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

2. UPGRADE to 3.2.10 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade phpbb

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 3.3.0 (Debian / Ubuntu)

apt-cache madison phpbb sudo apt install phpbb=<VERSION_BEFORE_3.3.0> sudo apt-mark hold phpbb

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

dnf --showduplicates list phpbb sudo dnf downgrade phpbb-<VERSION_BEFORE_3.3.0> sudo dnf versionlock add phpbb

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-2020-8226?

phpbb: upgrade to 3.2.10, 3.3.1. Exact commands for each OS are on this page.

Is CVE-2020-8226 being exploited?

CVE-2020-8226 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-2020-8226 affect?

CVE-2020-8226 affects phpbb. Severity is medium (CVSS 5.8). A vulnerability exists in phpBB <v3.2.10 and <v3.3.1 which allowed remote image dimensions check to be used to SSRF.

How urgent is CVE-2020-8226?

Priority 41/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-29199 HIGH 8.1 UPGRADE phpBB before 3.3.16 is vulnerable to Host Header Injection that can lead to password rest link poisoning
CVE-2025-70811 MEDIUM 4.3 DOWNGRADE Cross Site Request Forgery vulnerability in Phpbb phbb3 v.3.3.15 allows a local attacker to execute arbitrary
CVE-2025-70810 HIGH 8.8 DOWNGRADE Cross Site Request Forgery vulnerability in Phpbb phbb3 v.3.3.15 allows a local attacker to execute arbitrary
CVE-2023-5917 LOW 2.4 UPGRADE A vulnerability, which was classified as problematic, has been found in phpBB up to 3.3.10
CVE-2020-5502 MEDIUM 6.5 DOWNGRADE phpBB 3.2.8 allows a CSRF attack that can approve pending group memberships.

References

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