chore(deps): update dependency postcss to v8.5.10 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss (source)	8.5.1 → 8.5.10

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PostCSS has XSS via Unescaped </style> in its CSS Stringify Output

CVE-2026-41305 / GHSA-qx2v-qp2m-jg93

More information

Details

PostCSS: XSS via Unescaped </style> in CSS Stringify Output

Summary

PostCSS v8.5.5 (latest) does not escape </style> sequences when stringifying CSS ASTs. When user-submitted CSS is parsed and re-stringified for embedding in HTML <style> tags, </style> in CSS values breaks out of the style context, enabling XSS.

Proof of Concept

const postcss = require('postcss');

// Parse user CSS and re-stringify for page embedding
const userCSS = 'body { content: "</style><script>alert(1)</script><style>"; }';
const ast = postcss.parse(userCSS);
const output = ast.toResult().css;
const html = `<style>${output}</style>`;

console.log(html);
// <style>body { content: "</style><script>alert(1)</script><style>"; }</style>
//
// Browser: </style> closes the style tag, <script> executes

Tested output (Node.js v22, postcss v8.5.5):

Input: body { content: "</style><script>alert(1)</script><style>"; }
Output: body { content: "</style><script>alert(1)</script><style>"; }
Contains </style>: true

Impact

Impact non-bundler use cases since bundlers for XSS on their own. Requires some PostCSS plugin to have malware code, which can inject XSS to website.

Suggested Fix

Escape </style in all stringified output values:

output = output.replace(/<\/(style)/gi, '<\\/$1');

Credits

Discovered and reported by Sunil Kumar (@​TharVid)

Severity

• CVSS Score: 6.1 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

• https://github.com/postcss/postcss/security/advisories/GHSA-qx2v-qp2m-jg93
• https://nvd.nist.gov/vuln/detail/CVE-2026-41305
• https://github.com/postcss/postcss/releases/tag/8.5.10
• https://github.com/advisories/GHSA-qx2v-qp2m-jg93

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

postcss/postcss (postcss)

v8.5.10

Compare Source

• Fixed XSS via unescaped </style> in non-bundler cases (by @​TharVid).

v8.5.9

Compare Source

• Speed up source map encoding paring in case of the error.

v8.5.8

Compare Source

• Fixed Processor#version.

v8.5.7

Compare Source

• Improved source map annotation cleaning performance (by CodeAnt AI).

v8.5.6

Compare Source

• Fixed ContainerWithChildren type discriminating (by @​Goodwine).

v8.5.5

Compare Source

• Fixed package.json→exports compatibility with some tools (by @​JounQin).

v8.5.4

Compare Source

• Fixed Parcel compatibility issue (by @​git-sumitchaudhary).

v8.5.3

Compare Source

• Added more details to Unknown word error (by @​hiepxanh).
• Fixed types (by @​romainmenke).
• Fixed docs (by @​catnipan).

v8.5.2

Compare Source

• Fixed end position of rules with semicolon (by @​romainmenke).

---

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🚀 Performance Test Results

Test Configuration:

• VUs: 4
• Duration: 1m0s

Test Metrics:

• Requests/s: 49.51
• Iterations/s: 16.50
• Failed Requests: 0.00% (0 of 2980)

📜 Logs

> performance@1.0.0 run-tests:testenv /home/runner/work/rafiki/rafiki/test/performance
> ./scripts/run-tests.sh -e test -k -q --vus 4 --duration 1m

Cloud Nine GraphQL API is up: http://localhost:3101/graphql
Cloud Nine Wallet Address is up: http://localhost:3100/
Happy Life Bank Address is up: http://localhost:4100/
cloud-nine-wallet-test-backend already set
cloud-nine-wallet-test-auth already set
happy-life-bank-test-backend already set
happy-life-bank-test-auth already set
     data_received..................: 1.1 MB 18 kB/s
     data_sent......................: 2.3 MB 38 kB/s
     http_req_blocked...............: avg=6.72µs   min=1.73µs   med=5.34µs   max=579.18µs p(90)=6.63µs   p(95)=7.31µs  
     http_req_connecting............: avg=458ns    min=0s       med=0s       max=524.72µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=80.19ms  min=8.56ms   med=65.1ms   max=397ms    p(90)=135.69ms p(95)=156.24ms
       { expected_response:true }...: avg=80.19ms  min=8.56ms   med=65.1ms   max=397ms    p(90)=135.69ms p(95)=156.24ms
     http_req_failed................: 0.00%  ✓ 0         ✗ 2980
     http_req_receiving.............: avg=86.3µs   min=27.96µs  med=74.27µs  max=2.69ms   p(90)=113.29µs p(95)=146.77µs
     http_req_sending...............: avg=34.51µs  min=11.24µs  med=28.22µs  max=918.22µs p(90)=42.33µs  p(95)=54.69µs 
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=80.07ms  min=8.31ms   med=64.96ms  max=396.91ms p(90)=135.54ms p(95)=156.14ms
     http_reqs......................: 2980   49.513443/s
     iteration_duration.............: avg=242.26ms min=161.42ms med=230.85ms max=783.56ms p(90)=296.76ms p(95)=325.97ms
     iterations.....................: 993    16.498942/s
     vus............................: 4      min=4       max=4 
     vus_max........................: 4      min=4       max=4