CVE-2026-48799

HIGHPre-NVD 7.77.7
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (11th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
7.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Postiz is an AI social media scheduling tool. Prior to 2.21.8, Postiz fails to verify Nowpayments IPN callback authenticity against the payment provider shared secret and reads the target subscription identifier from the untrusted request body, allowing a low-privileged account to grant arbitrary organizations lifetime PRO subscriptions without payment. This issue is fixed in version 2.21.8.

CVSS v3
7.7
EG Score
7.7HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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)
Severity77% × 45%
The EG Score, 7.7 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
0.2%
EPSS %ILE
11th
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

July 15, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 15, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

v2.21.8

Patch available: gitroomhq/postiz-app v2.21.8

https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.8
Web page

PSA-2026-Q3TCPK: Unauthenticated arbitrary lifetime PRO grant via Nowpayments webhook — GAdvisory

https://gadvisory.org/advisories/PSA-2026-Q3TCPK
GitHub commit Patch Available

commit 23696d297351 (gitroomhq/postiz-app)

Patch available: gitroomhq/postiz-app v2.21.8 (contains commit 23696d297351)

https://github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf9827b05
GitHub advisoryMentions a patch (unverified)

Unauthenticated arbitrary lifetime PRO grant via Nowpayments webhook · Advisory · gitroomhq/postiz-app · GitHub

https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-j7rp-5mgj-qgg9

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 31× 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 100 of 126 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. None are among the latest 100 rows. The 26 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-12 16:00 UTCEG score recompute
  4. 2026-10-11 19:43 UTCEG score recompute
  5. 2026-10-11 16:58 UTCEG score recompute
  6. 2026-10-11 14:22 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  17. 2026-10-01 12:40 UTCEG score recompute
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  19. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  20. 2026-09-28 08:45 UTCEG score recompute
  21. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  22. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  23. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  24. 2026-09-24 08:50 UTCEG score recompute
  25. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 12th percentile
Show 75 more
  1. 2026-09-23 03:16 UTCEG score recompute
  2. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  4. 2026-09-18 04:45 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  6. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  7. 2026-09-13 23:12 UTCEG score recompute
  8. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  9. 2026-09-13 07:14 UTCEG score recompute
  10. 2026-09-11 21:46 UTCEG score recompute
  11. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  12. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  13. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  14. 2026-09-08 00:52 UTCEG score recompute
  15. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  16. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  17. 2026-09-05 20:50 UTCEG score recompute
  18. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  19. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  20. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  21. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  22. 2026-08-31 05:15 UTCEG score recompute
  23. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  24. 2026-08-30 03:52 UTCEG score recompute
  25. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  26. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  27. 2026-08-28 02:35 UTCEG score recompute
  28. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  29. 2026-08-27 01:23 UTCEG score recompute
  30. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  31. 2026-08-25 23:55 UTCEG score recompute
  32. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  33. 2026-08-24 20:35 UTCEG score recompute
  34. 2026-08-23 06:02 UTCEG score recompute
  35. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  36. 2026-08-22 04:50 UTCEG score recompute
  37. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  38. 2026-08-21 03:29 UTCEG score recompute
  39. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  40. 2026-08-20 00:16 UTCEG score recompute
  41. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  42. 2026-08-18 19:59 UTCEG score recompute
  43. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  44. 2026-08-17 16:49 UTCEG score recompute
  45. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  46. 2026-08-16 15:37 UTCEG score recompute
  47. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  48. 2026-08-16 03:01 UTCEG score recompute
  49. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  50. 2026-08-15 01:48 UTCEG score recompute
  51. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  52. 2026-08-14 00:37 UTCEG score recompute
  53. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  54. 2026-08-12 23:25 UTCEG score recompute
  55. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  56. 2026-08-11 22:14 UTCEG score recompute
  57. 2026-08-11 09:38 UTCEG score recompute
  58. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  59. 2026-08-09 19:50 UTCEG score recompute
  60. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  61. 2026-08-08 18:39 UTCEG score recompute
  62. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  63. 2026-08-07 17:27 UTCEG score recompute
  64. 2026-08-06 16:15 UTCEG score recompute
  65. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  66. 2026-08-06 03:39 UTCEG score recompute
  67. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  68. 2026-08-05 01:37 UTCEG score recompute
  69. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  70. 2026-08-04 13:01 UTCEG score recompute
  71. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  72. 2026-08-03 22:16 UTCEG score recompute
  73. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  74. 2026-08-02 08:26 UTCEG score recompute
  75. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.2% · 6th percentile

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Frequently asked(5)

What is CVE-2026-48799?
CVE-2026-48799 is a high-severity vulnerability; its CVE record was published on July 15, 2026. Postiz is an AI social media scheduling tool. Prior to 2.21.8, Postiz fails to verify Nowpayments IPN callback authenticity against the payment provider shared secret and reads the target subscription identifier from the untrusted request body, allowing a low-privileged account to grant arbitrary…
When was the CVE record for CVE-2026-48799 published?
The CVE record for CVE-2026-48799 was published on July 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 15, 2026; the record at its source may have been updated since.
Is CVE-2026-48799 actively exploited?
CVE-2026-48799 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48799?
CVE-2026-48799 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-48799?
A fix for CVE-2026-48799 is available: update to the fixed version the vendor names in its advisory.

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