CVE-2026-79663

MEDIUMPre-NVD 4.84.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 4.8 from GitHub Security Advisory published 2026-08-25. A secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
4.8EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Ech0 before 4.7.3 contains a stored cross-site scripting vulnerability in the public RSS feed where tag names and markdown content are rendered without HTML escaping. Attackers with admin privileges can inject malicious tag names or raw HTML in echo content that executes as JavaScript in RSS readers that render HTML-type summaries, affecting anonymous subscribers and other users.

CVSS v3
4.8
EG Score
4.8MEDIUMmedium confidence
EG Risk
22
EG Risk 22/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity48% × 45%
The EG Score, 4.8 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
15th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 25, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 25, 2026
Patch available. Sources: github.
Web page

Ech0 before 4.7.3 Stored XSS via RSS feed tag names | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-rss-feed-tag-names
GitHub advisoryMentions a patch (unverified)

RSS feed renders unescaped tag names and raw-HTML markdown, stored XSS against subscribers · Advisory · lin-snow/Ech0 · GitHub

https://github.com/lin-snow/Ech0/security/advisories/GHSA-3v85-fqvh-7rxf

Vendor Advisories for CVE-2026-79663(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFix by version rangeDependents
github.com/lin-snow/ech0—
  • every version up to 1.4.8-0.20260503035519-fd320fe3e902: fixed in 1.4.8-0.20260503035519-fd320fe3e902
—
github.com/lin-snow/Ech0—
  • every version up to 1.4.8-0.20260503035519-fd320fe3e902: fixed in 1.4.8-0.20260503035519-fd320fe3e902
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 76× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 129 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 31 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  2. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  3. 2026-10-12 14:58 UTCEG score recompute
  4. 2026-10-11 19:22 UTCEG score recompute
  5. 2026-10-11 16:38 UTCEG score recompute
  6. 2026-10-11 13:56 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  9. 2026-10-10 12:17 UTCEG score recompute
  10. 2026-10-10 12:16 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  12. 2026-10-09 06:16 UTCEG score recompute
  13. 2026-10-09 06:16 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  14. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  15. 2026-10-08 05:03 UTCEG score recompute
  16. 2026-10-08 05:03 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  18. 2026-10-07 03:49 UTCEG score recompute
  19. 2026-10-07 03:49 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  20. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  21. 2026-10-06 02:37 UTCEG score recompute
  22. 2026-10-06 02:37 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  24. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  25. 2026-10-04 19:50 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
Show 73 more
  1. 2026-10-03 16:27 UTCEG score recompute
  2. 2026-10-03 16:27 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  3. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  4. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  5. 2026-10-02 09:14 UTCEG score recompute
  6. 2026-10-02 09:14 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  7. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  8. 2026-10-01 08:02 UTCEG score recompute
  9. 2026-10-01 08:02 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  10. 2026-09-30 06:50 UTCEG score recompute
  11. 2026-09-30 06:50 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  12. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  13. 2026-09-29 00:32 UTCEG score recompute
  14. 2026-09-29 00:32 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  15. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  16. 2026-09-27 23:20 UTCEG score recompute
  17. 2026-09-27 23:20 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  18. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  19. 2026-09-26 22:07 UTCEG score recompute
  20. 2026-09-26 22:07 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  21. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  22. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  23. 2026-09-25 00:46 UTCEG score recompute
  24. 2026-09-25 00:46 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  26. 2026-09-23 23:34 UTCEG score recompute
  27. 2026-09-23 23:34 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  28. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  29. 2026-09-22 22:22 UTCEG score recompute
  30. 2026-09-22 22:22 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  31. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  32. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  33. 2026-09-21 21:08 UTCEG score recompute
  34. 2026-09-21 21:08 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  35. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  36. 2026-09-20 19:56 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  37. 2026-09-19 18:44 UTCEG score recompute
  38. 2026-09-19 18:44 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  39. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  40. 2026-09-18 17:32 UTCEG score recompute
  41. 2026-09-18 17:32 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  42. 2026-09-17 16:19 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  43. 2026-09-16 15:07 UTCEG score recompute
  44. 2026-09-16 15:07 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  45. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  46. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  47. 2026-09-15 13:55 UTCEG score recompute
  48. 2026-09-15 13:55 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  49. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  50. 2026-09-14 12:43 UTCEG score recompute
  51. 2026-09-14 12:43 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  52. 2026-09-13 11:20 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  53. 2026-09-12 10:08 UTCEG score recompute
  54. 2026-09-12 10:08 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  55. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  56. 2026-09-11 08:54 UTCEG score recompute
  57. 2026-09-11 08:54 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  58. 2026-09-10 07:42 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  59. 2026-09-09 06:30 UTCEG score recompute
  60. 2026-09-09 06:30 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  61. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  62. 2026-09-08 05:18 UTCEG score recompute
  63. 2026-09-08 05:18 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  64. 2026-09-07 04:01 UTCEG score recompute
  65. 2026-09-07 04:01 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  66. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  67. 2026-09-06 02:48 UTCEG score recompute
  68. 2026-09-06 02:48 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  69. 2026-09-05 01:36 UTCEG score recompute
  70. 2026-09-05 01:36 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  71. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  72. 2026-09-04 00:24 UTCGHSA enrichmentGHSA-9277-65xq-8gww · GitHub CVSS 4.8
  73. 2026-09-02 23:09 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-79663?
CVE-2026-79663 is a medium-severity vulnerability; its CVE record was published on August 25, 2026. Ech0 before 4.7.3 contains a stored cross-site scripting vulnerability in the public RSS feed where tag names and markdown content are rendered without HTML escaping. Attackers with admin privileges can inject malicious tag names or raw HTML in echo content that executes as JavaScript in RSS…
When was CVE-2026-79663 made public?
CVE-2026-79663 was made public on May 3, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 25, 2026. EchelonGraph's copy of the record carries a last-modified date of August 31, 2026; the record at its source may have been updated since.
Is CVE-2026-79663 actively exploited?
CVE-2026-79663 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (15th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-79663?
CVE-2026-79663 has a CVSS base score of 4.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-79663?
A fix for CVE-2026-79663 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-79663 are linked in the Vendor Advisories panel on this page.

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