CVE-2026-79670

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 weekElevated
4.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Ech0 before 4.4.3 contains a stored cross-site scripting vulnerability in the file upload endpoint that validates Content-Type using only client-supplied headers without server-side inspection. Attackers with admin privileges can upload SVG or HTML files containing JavaScript that executes in the application origin when accessed by any user, enabling session hijacking and data exfiltration.

CVSS v3
4.8
EG Score
4.8MEDIUMmedium confidence
EG Risk
38
EG Risk 38/100

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.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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 low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation public PoC (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 4.4.3 Stored XSS via SVG Upload | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-svg-upload
GitHub advisoryMentions a patch (unverified)

Stored XSS via SVG Upload and Content-Type Validation Bypass in File Upload · Advisory · lin-snow/Ech0 · GitHub

https://github.com/lin-snow/Ech0/security/advisories/GHSA-69hx-63pv-f8f4

Vendor Advisories for CVE-2026-79670(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/lin-snow/ech0—
  • every version up to 4.4.3: fixed in 4.4.3
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 82× 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 139 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 41 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 12:15 UTCEG score recompute
  10. 2026-10-10 12:15 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  12. 2026-10-09 04:29 UTCEG score recompute
  13. 2026-10-09 04:29 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  14. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  15. 2026-10-08 03:30 UTCEG score recompute
  16. 2026-10-08 03:30 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  18. 2026-10-07 00:25 UTCEG score recompute
  19. 2026-10-07 00:24 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  20. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  21. 2026-10-06 02:34 UTCEG score recompute
  22. 2026-10-06 02:34 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  24. 2026-10-05 00:02 UTCEG score recompute
  25. 2026-10-05 00:02 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
Show 73 more
  1. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  2. 2026-10-04 02:14 UTCEG score recompute
  3. 2026-10-04 02:14 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  4. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  5. 2026-10-03 01:34 UTCEG score recompute
  6. 2026-10-03 01:34 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  7. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  8. 2026-10-02 03:40 UTCEG score recompute
  9. 2026-10-02 03:40 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  11. 2026-10-01 05:36 UTCEG score recompute
  12. 2026-10-01 05:36 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  13. 2026-09-30 06:50 UTCEG score recompute
  14. 2026-09-30 06:50 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  15. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  16. 2026-09-28 21:30 UTCEG score recompute
  17. 2026-09-28 21:30 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  18. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  19. 2026-09-27 19:54 UTCEG score recompute
  20. 2026-09-27 19:54 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  21. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  22. 2026-09-26 22:07 UTCEG score recompute
  23. 2026-09-26 22:07 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  25. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  26. 2026-09-25 12:27 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  27. 2026-09-24 14:40 UTCEG score recompute
  28. 2026-09-24 14:40 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  29. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  30. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  31. 2026-09-23 16:53 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  32. 2026-09-22 19:06 UTCEG score recompute
  33. 2026-09-22 19:06 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  34. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  35. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  36. 2026-09-21 20:16 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  37. 2026-09-20 22:29 UTCEG score recompute
  38. 2026-09-20 22:29 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  39. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  40. 2026-09-20 00:43 UTCEG score recompute
  41. 2026-09-20 00:43 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  42. 2026-09-19 02:57 UTCEG score recompute
  43. 2026-09-19 02:57 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  44. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  45. 2026-09-18 05:10 UTCEG score recompute
  46. 2026-09-18 05:10 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  47. 2026-09-17 07:23 UTCEG score recompute
  48. 2026-09-17 07:23 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  49. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  50. 2026-09-16 09:25 UTCEG score recompute
  51. 2026-09-16 09:25 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  52. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  53. 2026-09-15 11:32 UTCEG score recompute
  54. 2026-09-15 11:32 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  55. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  56. 2026-09-14 13:44 UTCEG score recompute
  57. 2026-09-14 13:44 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  58. 2026-09-13 15:48 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  59. 2026-09-12 17:59 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  60. 2026-09-11 20:12 UTCEG score recompute
  61. 2026-09-11 20:12 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  62. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  63. 2026-09-10 22:05 UTCEG score recompute
  64. 2026-09-10 22:05 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  65. 2026-09-10 00:18 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  66. 2026-09-09 01:34 UTCEG score recompute
  67. 2026-09-09 01:34 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  68. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  69. 2026-09-08 03:47 UTCEG score recompute
  70. 2026-09-08 03:47 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  71. 2026-09-07 05:59 UTCEG score recompute
  72. 2026-09-07 05:59 UTCGHSA enrichmentGHSA-mj42-9vh2-f8v3 · GitHub CVSS 4.8
  73. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.1% · 4th percentile

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Frequently asked(5)

What is CVE-2026-79670?
CVE-2026-79670 is a medium-severity vulnerability; its CVE record was published on August 25, 2026. Ech0 before 4.4.3 contains a stored cross-site scripting vulnerability in the file upload endpoint that validates Content-Type using only client-supplied headers without server-side inspection. Attackers with admin privileges can upload SVG or HTML files containing JavaScript that executes in the…
When was CVE-2026-79670 made public?
CVE-2026-79670 was made public on April 9, 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-2026-79670 actively exploited?
CVE-2026-79670 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-2026-79670?
CVE-2026-79670 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-2026-79670?
A fix for CVE-2026-79670 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-79670 are linked in the Vendor Advisories panel on this page.

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