CVE-2021-46251: A reflected cross-site scripting (XSS) in ScratchOAuth2 before commit 1603f04e44ef67dde6ccffe866d2dca16defb293

Q: How do I fix CVE-2021-46251?

scratchoauth2: upgrade to 2021-04-12. Exact commands for each OS are on this page.

Q: Is CVE-2021-46251 being exploited?

CVE-2021-46251 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-2021-46251 affect?

CVE-2021-46251 affects scratchoauth2. Severity is medium (CVSS 6.1). A reflected cross-site scripting (XSS) in ScratchOAuth2 before commit 1603f04e44ef67dde6ccffe866d2dca16defb293 allows attackers to execute arbitrary web scripts or HTML via a crafted POST request.

Q: How urgent is CVE-2021-46251?

Priority 33/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2021-46251 is a medium-severity flaw (CVSS 6.1) affecting scratchoauth2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected cross-site scripting (XSS) in ScratchOAuth2 before commit 1603f04e44ef67dde6ccffe866d2dca16defb293 allows attackers to execute arbitrary web scripts or HTML via a crafted POST request.

Why this priority

No elevated risk signals yet

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	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-02-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: scratchoauth2 project

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

Am I affected?

Timeline

2022-02-15 23:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

scratchoauth2 project scratchoauth2 UPGRADE

Affected: < 2021-04-12

Fixed in: 2021-04-12

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy scratchoauth2 || rpm -q scratchoauth2 || scratchoauth2 --version

2. UPGRADE to 2021-04-12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade scratchoauth2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade scratchoauth2

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-2021-46251?

scratchoauth2: upgrade to 2021-04-12. Exact commands for each OS are on this page.

Is CVE-2021-46251 being exploited?

CVE-2021-46251 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-2021-46251 affect?

CVE-2021-46251 affects scratchoauth2. Severity is medium (CVSS 6.1). A reflected cross-site scripting (XSS) in ScratchOAuth2 before commit 1603f04e44ef67dde6ccffe866d2dca16defb293 allows attackers to execute arbitrary web scripts or HTML via a crafted POST request.

How urgent is CVE-2021-46251?

Priority 33/100. No elevated risk signals yet.

Related CVEs

CVE-2021-46250 CRITICAL 10.0 UPGRADE An issue in SOA2Login::commented of ScratchOAuth2 before commit a91879bd58fa83b09283c0708a1864cdf067c64a allow
CVE-2021-46249 MEDIUM 6.5 UPGRADE An authorization bypass exploited by a user-controlled key in SpecificApps REST API in ScratchOAuth2 before co
CVE-2021-29437 HIGH 8.0 UPGRADE ScratchOAuth2 is an Oauth implementation for Scratch

References

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