8.6

CVE-2026-50555: angular Cross-site Scripting

CVSS: 8.6v4.0HighAnalyzed
AliasesUBUNTU-CVE-2026-50555DEBIAN-CVE-2026-50555GHSA-hqr9-c56f-3x7f
Published 22-06-2026Last modified 22-06-2026
Open JSON

Vulnerability summary

CVE-2026-50555 is a high (CVSS 8.6) Cross-site Scripting vulnerability in angular. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 17.6% of scored vulnerabilities.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.6/10
010
High · v4.0 (CVE.org)
EPSS score
0.27%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 22-06-2026
    PublishedVulnerability first disclosed.
  2. 22-06-2026
    Last modifiedVulnerability information updated.

Description

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.16, 20.3.24, and 19.2.25, a Cross-Site Scripting (XSS) vulnerability exists in @angular/platform-server's DOM emulation dependency (domino) when serializing the content of raw-text elements (such as <script>, <style>, and <iframe>). domino supports escaping raw-text elements during serialization to prevent closing-tag breakout. However, a Unicode index alignment bug existed in this escaping logic. In JavaScript, string lengths and character indices are calculated based on UTF-16 code units (where astral characters—such as emojis—occupy 2 code units / 4 bytes). If the bound dynamic text contained astral Unicode characters before the closing tag (e.g. </script>, </style>, or </iframe>), the index offset calculation in domino's replacement logic shifted. This misalignment caused domino to fail to replace or escape the closing tag, leaving it raw and unescaped in the output HTML. An attacker who controls the dynamic text can supply a payload containing both an astral Unicode character and a closing tag (e.g., 😀</iframe><script>alert(1)</script>). When serialized on the server during SSR, the browser parses the unescaped closing tag, exits the raw-text context early, and executes the subsequent <script> block, leading to same-origin Cross-Site Scripting (XSS). This vulnerability is fixed in 22.0.0-rc.2, 21.2.16, 20.3.24, and 19.2.25.

CVSS metrics

8 scores · 5 sources · 2 versions

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

18%

Versus all other CVEs

30-day change

0.00 pp

From 0.27% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.27%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

@angular1 product
  • platform-server≥ 22.0.0-next.0, < 22.0.0-rc.2 | ≥ 21.0.0-next.0, < 21.2.16 | ≥ 20.0.0-next.0, < 20.3.24 | ≥ 19.0.0-next.0, < 19.2.25 | ≤ 18.2.14
Angular1 product
  • angular≥ 22.0.0-next.0, < 22.0.0-rc.2 | ≥ 21.0.0-next.0, < 21.2.16 | ≥ 20.0.0-next.0, < 20.3.24 | ≥ 19.0.0-next.0, < 19.2.25 | ≤ 18.2.14 | ≥ 19.0.0, < 19.2.25 | ≥ 20.0.0, < 20.3.24 | ≥ 21.0.0, < 21.2.6 | 22.0.0:next0 | 22.0.0:next1 | 22.0.0:next10 | 22.0.0:next11 | 22.0.0:next12 | 22.0.0:next2 | 22.0.0:next3 | 22.0.0:next4 | 22.0.0:next5 | 22.0.0:next6 | 22.0.0:next7 | 22.0.0:next8 | 22.0.0:next9 | 22.0.0:rc0 | 22.0.0:rc1
Debian1 product
  • angular.jsAll versions (No fix recorded)
Ubuntu1 product
  • angular.jsAll versions (No fix recorded)

4 vendors · 4 products

References

7 links