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CVE-2021-28378· NVD / CVE Program· CNA mitre

Gitea 1.12.x and 1.13.x before 1.13.4 allows XSS via certain issue data in some situations.

MediumCVSS 5.4 · v3.1—Proof of concept Fix available

Noroxi analysis

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Published
Mar 15, 2021
Updated
Jun 16, 2026
EPSS
8.8% · 95th percentile
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Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
21 / 40 · 5.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
3 / 30 · 8.8%

CNA vs NVD score

NVD
5.4
CNA · mitre
3.7
1.7 point gap

CVSS:3.1/AC:H/AV:N/A:N/C:L/I:L/PR:L/S:U/UI:R

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
giteagitea

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • gitea gitea1.12.0 and later · up to 1.12.6 inclusive
  • gitea gitea1.13.0 and later · before 1.13.4

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gocode.gitea.io/giteabefore 1.13.41.13.4

Same product

gitea: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-60004Gitea before 1.27.1 allows remote code execution via the diffpatch API through Git hook installation.KEV
    76This week
  • CVE-2020-14144The git hook feature in Gitea 1.1.0 through 1.12.5 might allow for authenticated remote code execution in customer environments where the do
    57Plan
  • CVE-2022-30781Gitea before 1.16.7 does not escape git fetch remote.
    56Plan
  • CVE-2019-11229models/repo_mirror.go in Gitea before 1.7.6 and 1.8.x before 1.8-RC3 mishandles mirror repo URL settings, leading to remote code execution.
    51Plan
  • CVE-2022-1058Open Redirect on login in go-gitea/gitea
    40Plan
  • CVE-2021-45327Gitea before 1.11.2 is affected by Trusting HTTP Permission Methods on the Server Side when referencing the vulnerable admin or user API.
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go:code.gitea.io/gitea1.13.4Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:42021-08-01

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+139 d
  3. TodaySep 30, 2026+2026 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

nvd-primary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records